ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

A novel Cu–Cu₂O junction structure for the ultrasensitive detection of dopamine

Ping-ping Yang, Jun-hui Wu, Ru-ni Hou, Si-jia Tang, Hai-hu Tan, Jing-jing Du, Li-jian Xu, and Zeng-min Tang

College of Life Science and Chemistry, Hunan University of Technology, Zhuzhou, People’s Republic of China

E-mail: xlj235@hut.edu.cn

Received: 24 January 2024  Accepted: 18 July 2024

Abstract:

In this study, a Cu–Cu₂O junction structure was grown in situ on the surface of Cu plates via chemical etching at room temperature. A novel dopamine (DA) electrochemical sensor based on Cu–Cu₂O/glassy carbon electrode (Cu–Cu₂O/GCE) was constructed. The Cu–Cu₂O/GCE sensor exhibited a wide linear range of 0.03–2.45 mM and a low limit of detection of 7.1 nM (S/N = 3) for DA. The enhanced performance was due to the unique void structure, which increased catalytic active sites and electrochemical active surface areas. Moreover, the optimization of the Cu₂O–to–Cu ratio allowed for the effective regulation of the electron configuration of the Cu–Cu₂O junction structure. The Cu–Cu₂O/GCE sensor also exhibited good reproducibility, stability, and anti-interference ability.

Keywords: Cu–Cu2O junction structure; Void structure; Chemical etching; Sensor; Dopamine

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03638-5

Chemical Papers 78 (14) 7845–7853 (2024)